//
// PullLogsExample.cs
//
// Author:
//       MiNG <developer@ming.gz.cn>
//
// Copyright (c) 2018 Alibaba Cloud
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Aliyun.Api.LogService.Domain.Log;
using Aliyun.Api.LogService.Infrastructure.Protocol.Http;

namespace Aliyun.Api.LogService.Examples.ApiUsage
{
    public static class PullLogsExample
    {
        private static readonly String LogStoreName = "example-logstore";

        public static async Task<IEnumerable<LogInfo>> PullLogs(ILogServiceClient client)
        {
            // 获取ShardId
            var listShardsResponse = await client.ListShardsAsync(LogStoreName);
            var listShardsResult = listShardsResponse.EnsureSuccess().Result;
            var shardId = listShardsResult.First().ShardId;

            // 获取游标
            var getCursorRsponse = await client.GetCursorAsync(LogStoreName, shardId, "begin");
            var getCursorResult = getCursorRsponse.EnsureSuccess().Result;
            var cursor = getCursorResult.Cursor;

            // 在指定分片（shard）上从游标（cursor）开始位置获取100条日志
            var response = await client.PullLogsAsync(LogStoreName, shardId, cursor, 100);
            var result = response.EnsureSuccess().Result;
            
            // 获取Header上的下一条游标（cursor）位置
            var nextCursor = response.GetLogCursor();

            return result.LogGroups
                .SelectMany(x => x.Logs);
        }
    }
}
